diff --git a/packages/backend/src/server/api/endpoints/users/show.ts b/packages/backend/src/server/api/endpoints/users/show.ts
index 29f24b045a240aaad03a83c0020ca2b5da7b4c44..ba432c273bfb7dbc42d8df9d98764723ac41d66a 100644
--- a/packages/backend/src/server/api/endpoints/users/show.ts
+++ b/packages/backend/src/server/api/endpoints/users/show.ts
@@ -48,6 +48,7 @@ export const meta = {
 			message: 'No such user.',
 			code: 'NO_SUCH_USER',
 			id: '4362f8dc-731f-4ad8-a694-be5a88922a24',
+			httpStatusCode: 404,
 		},
 	},
 } as const;
diff --git a/packages/backend/test/e2e/endpoints.ts b/packages/backend/test/e2e/endpoints.ts
index 0a45a320f9af1c69f0633b2c7dc04b9098a72254..afb72c84d40e4bdcc89851c8cb9ec3c2f9ade48e 100644
--- a/packages/backend/test/e2e/endpoints.ts
+++ b/packages/backend/test/e2e/endpoints.ts
@@ -162,14 +162,14 @@ describe('Endpoints', () => {
 			const res = await api('/users/show', {
 				userId: '000000000000000000000000',
 			});
-			assert.strictEqual(res.status, 400);
+			assert.strictEqual(res.status, 404);
 		});
 
 		test('間違ったIDで怒られる', async () => {
 			const res = await api('/users/show', {
 				userId: 'kyoppie',
 			});
-			assert.strictEqual(res.status, 400);
+			assert.strictEqual(res.status, 404);
 		});
 	});